Thread-cutting device



April l, 1930. T. M. LILI EBERG 1,752,915 K THREAD CUTTING DEVI CE FiledApril 23, 1928 Patented Apr. '1,' 1930 UNITED STATES 1 `A1-1=1NT4oFF-rcs f TIDEMAN MI. Il11212D1511BEEIBETr,V OF CHICAGO, ILLINOIS,ASSIGNOR TO'THE' NYE TOOL @c MA- CHINE WORKS,YO F CHICAGO, ILLINOIS, ACORPORATION 'OF AILLINOIS THREAD-CUTTING" DEVICE Application mea April23,

My invention relates to thread-cutting devices of the type in which thethread-cutting elements are carried by a head having a portion forming ajournal support for an oper- 5. ating member, suchas a'lever provi-dedwith a ratchet cooperating with ratchet teeth on the head. Y Y

, One of my objectsis to provide a thread cuttingfdevice of thegeneraltype referred to and employing asthe thread cutting element asolid die block which, as .commonly constructed, contains an opening`therethrough into which the thread-cutters extend, the die block andholdinghead therefor 'of' which may be readily assembledanddisassembled, as desired.

To provide a novel, simple and economical i construction of the typeabove referred to.`

To provide a construction of the type referred to, and employing a dieblock, which shall present the maximum of strength with the minimumamount ofmetal, and thedie block of which may be readily removed andreplaced, or another substituted, as desired.

To provide a construction of the type referred to and employing a dieblock whereby a plurality of die blocks of different sizes assembledwith holding heads, respectively, and having openings therethrough ofthe dersired sizes for cooperation with the particular sizes of dieblocks used therewith may be interchangeably used with an operatingmember such as that above referred to and for journal support on theheads; and other ob- 5 jects as will be manifest from the followingdescription.

Referring to the accompanying drawing Figure 1 is a view in sideelevation of a thread cutting device constructed in accordance with myinvention.

Figure 2 is a sectional view taken at theirregular line 2 2 on Fig., 1and viewed in the direction of the arrows.

Figure 3 is a section taken at the line 3 on Fig. 2 and viewed in thedirection of the arrow.

Figure 4 is a view like Fig. 2 of a modificay5 0 tion of the die blockholding head; an-d 1928. sei-iai no. 272,110.

Figure 5, a similar view ofv another modification of the' die blockholding head.

Referring to the particular construction shown, the device comprises V4ahead 'represented at 6, one end thereof beingof reduced diameteras shownat7 and at which portion it is providedperipherally with ratchet teeth 8the ortion7 formino a 'ournalsu ort for f 7 P e l PP an. operatingmember 9 shown as comprising a bar 10 connected with and extendlngoutwardly from, a body member 11 'containing an aperture 12 therethroughat which it surrounds the j ournalling Vportion 7 of the head 6, Y themember ,11 being provided with a ratchet 13v provided with a'tooth lllat which `it engages the teethS on the,head'6, this f ratchet, which isspringpressed toward the teeth 8 by a coil spring 15having a stem 16projecting into a position'in vwhich it is accessible for retracting theratchet 13 when desired, which feature is kin accordance with commonpractice. v v f The cutting elementof the device comprises a round dieblock 17 containing an opening 18 therethrough linto which the threadcutting portions 19 of the die block extend in accordance with commonpractice;

The die block 17 is positioned againstfthe outer face of the larger end20 of the head 6 and is held in place thereon lby a ring 21 internallythreaded at'one end as represented at 22 at whichit screws upon externalthreads 23 provided about fthefperiphery of the portionjorflange 2Oofthe head, the die block 17 being preferably f-interlocke'd v.with thehead G11-to prevent Vrelative rotationfofthese parts, asl for examplebyk:means of pins 24 'l secured in the portionv 20 of the head 6 to extend1engthwisethereofv with their protruding ends projecting into rearwardlyopening recesses 25 in thedie block v17.j I The head 6contains anopening 26 extendlng entirely therethrough coincident with thelongitudinal axis of thislhead, this opening being of slightly largerdiameter thanv the diameter of the space bounded by the teethofthe'cutting portions19 of the die block, the parts being so constructed,as shown that the opening 18 inthe die block extends lin alignment withthe opening 26.

object in the thread cutting operation and at,

the same time, permit the object to forma support for the device at itsratchet toothed portion.

Referring to the particular construction of means shown in Figs. 1 and2' for holding the die blockagainst thefaceof the head 6, the

ring `21`isf0rmed at its outer endwith an internal annular taperedsurface27 which flares inwardly,the die block 17 in this instance beingtapered ata similar angle toward its outer end as represented at 28.Thus as the ring 21 is screwed to place it firmly wedges the die block17, in position against the head` The construction shown in Fig. 4 is`the Same as that shown in Fig. 2 except that the tapers on the,ring.21and die block 17 and represented at 29 and 30, respectively, are steeperand shorter than in the case of the taperedsuraces 27 and 28 of Fig. 2.

The construction shown in Fig. 5 is the same as that; shownin Fig..2except that in` stead of providing for the wedging of the die block`against the head by the action of the rng `21" the die block is held inposition by means of the engagement of an inwardly extendingannularflange 31 atthe outer end of the ring against an annular shoulder 32formed on theouter face of thev die block by peripherally recessing itas shown.

It will be understood that as to all of the forms of structures shownthe die block may be readily removed fromthe head merely by unscrewingthe ring and this die block, or a substitute therefor, readily securedin place on the head by replacing thering. i

Furthermore, and this applies particularly` tothe construction shown inFig. `2the ring 21 b i having `surrounding engagement with the ieblockserves tol reenforce the peripheral walliof` thedie-block` and thus thelatter maybe made much thinner than is possible where the die block isnotso reenforced, which makes for durability of structure by the use ofthe minimum amount of metal.`

In 0f di erent` diameter be threaded by the device, a plurality ofjthedie-block-equipped heads: would be provided, each die block of'adifferent size and eachcooperating head with the diameter ofits opening26 proportionately varied', these severaldie-equipped units, each ot'whichiwould-` present a journallingportion ot' thegsame externaldiameter for the operatingmember 9,being interchangeablewhere-` `by butone operatinglmember 973111266. be used ractice where it is desired thatobjects for the entire set of the die-equipped heads, it beingunderstood that the die-equipped hea-d may be readilyremoved from theoperating l handle upon withdrawing the ratchet from engagement with theteeth on the head.

Vhile I have illustrated and described certain particular embodiments'ofmy invention I do not wish to be understood as intending to limit itthereto as the same may be variously modified and altered and theinvention embodied in other forms without departing from the spirit ofmy invention. I

What I claim as new, and desire to secure by Letters Patent, is

A thread-cutting device comprising a head having a cylindrical portion,an outwardly extending flange at one end of said portion havingperipheral screw threads, an operatingmeans journalled on saidcylindrical portion and coacting therewith, a die block entirelyexteriorly of said head having its base in contact with the outer sidewall of said flange, whereby said operating member and die block are onopposite sides of the flange to aid in reinforcing the same, a ringsurrounding said flange and screw threaded thereto, said ring extendingoutwardly beyond the flange and overlapping the die block whereby saidflange and die block are both peripherally reinforced, said die-blockhaving a tapered peripheral face, said ring also extendingfinwardly andhaving a tapered clamping face corresponding to and engaging the taperedface of the die-block to clamp the latter against theiiange, and a pinconnection detachably holding the die-block against rotation. i

TIDEMAN M. LILLEBERG.

